Battery device and electric appliance

Abstract

The embodiment of the application provides a battery device and a power utilization equipment, and belongs to the technical field of batteries.The battery device comprises a box body, a plurality of battery monomers arranged in the box body, a bus bar electrically connected with the plurality of battery monomers, and a thermal management component arranged in the box body and configured to exchange heat with at least the bus bar.The thermal management component comprises at least two heat exchange pieces, the heat exchange pieces are arranged in layers to form heat exchange flow channels between adjacent two layers of heat exchange pieces, the heat exchange flow channels are used to guide a heat exchange medium to exchange heat with the bus bar, at least one heat exchange piece is arranged as a flexible piece, and the elastic modulus of the flexible piece is less than or equal to 300 MPa.Through the structural design that the thermal management component exchanges heat with at least the bus bar, the thermal management component can adapt to the deformation or vibration of the bus bar during long-term use, maintain efficient and stable heat dissipation, reduce the overall weight of the battery device, reduce the manufacturing cost and the logistics cost, and reduce the production cost of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical appliance. Background Technology

[0002] During battery charging and discharging, the busbar generates a large amount of heat. If this heat cannot be dissipated effectively and in a timely manner, the busbar temperature will rise, affecting battery performance and lifespan, and potentially even causing safety accidents. Existing battery devices often use aluminum alloy water-cooled plates as heat dissipation components to cool the busbar.

[0003] Although aluminum alloy water-cooled plates have a certain heat dissipation effect, they have the following disadvantages: First, aluminum alloy water-cooled plates are difficult to adapt to the deformation or vibration of the busbar, and long-term use can easily lead to poor contact and reduce heat dissipation efficiency; second, aluminum alloy water-cooled plates are relatively heavy, which increases the overall weight of the battery device and is not conducive to the lightweight design of the battery device; third, the manufacturing cost and logistics cost of aluminum alloy water-cooled plates are high, which increases the production cost of the battery device. Summary of the Invention

[0004] This application provides a battery device and an electrical appliance to improve heat dissipation efficiency and reduce the overall weight and production cost of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, including:

[0006] Box;

[0007] Multiple battery cells are housed within the casing;

[0008] Busbar, electrically connecting the multiple battery cells;

[0009] A thermal management component is disposed within the housing and configured to exchange heat with at least the manifold; wherein the thermal management component includes at least two heat exchange elements, the heat exchange elements are stacked to form a heat exchange channel between adjacent layers of the heat exchange elements, the heat exchange channel is used to conduct heat exchange medium that exchanges heat with the manifold, and at least one of the heat exchange elements is configured as a flexible element, the elastic modulus of the flexible element being less than or equal to 300 MPa.

[0010] In the above technical solution, through the structural design of the thermal management component exchanging heat with the busbar, the thermal management component can promptly remove the heat generated by the busbar, and can adapt to the deformation or vibration of the busbar during long-term use, maintaining efficient and stable heat dissipation. Moreover, under the same size, the weight of the thermal management component is significantly reduced compared to the weight of the traditional aluminum water-cooled plate, thereby reducing the overall weight of the battery device and realizing the lightweight design of the battery device. This is conducive to improving the energy density of the battery device. In addition, it significantly reduces manufacturing and processing costs as well as logistics and transportation costs, thereby reducing the production cost of the battery device and facilitating its promotion and use.

[0011] In some embodiments, the thermal management component is at least attached to the surface of the busbar that is away from the terminal post of the battery cell in a first direction.

[0012] In some embodiments, the plurality of battery cells are arranged along a second direction and a third direction. The thermal management component includes a main board body and a flange folded relative to the main board body toward the direction where the battery cells are located. The flange is connected to at least one side of the main board body along the second direction and the third direction. The main board body is attached to the surface of the busbar away from the terminal post along the first direction. The flange is attached to at least one side of the outermost busbar. The first direction, the second direction, and the third direction intersect each other.

[0013] In the above technical solution, through the arrangement of the main board and the flange, most of the heat from the multiple busbars is quickly dissipated through the contact between the large surface and the main board. The contact between the side surface and the flange can assist in heat dissipation, forming a three-dimensional heat dissipation channel. In addition to cooling the large surface of the multiple busbars, the outermost part of the busbars is further cooled from the side, which further increases the heat exchange area of ​​the thermal management components for the multiple busbars, thereby further improving the heat dissipation efficiency. Moreover, the arrangement of the flange makes full use of the space on the side of the busbars without increasing the overall size of the battery device, thereby improving the internal space utilization of the battery device and helping to achieve the compactness and miniaturization of the battery device.

[0014] In some embodiments, the flange includes a first segment and a second segment that are bent and connected together. The first segment is connected between the motherboard body and the second segment and is attached to one side of the outermost busbar. The second segment is attached to the end cap of the outermost battery cell.

[0015] In the above technical solution, the structural design of the flange consisting of the first and second sections enables the thermal management component to not only dissipate heat on the large surface of each busbar and part of the side of the busbar, but also to directly transfer the heat generated by the end cap of the outermost battery cell to the internal cooling medium. This can effectively reduce the temperature of the end cap of the outermost battery cell. Using this structure increases the heat exchange area and heat exchange path of the thermal management component, improving the overall heat exchange efficiency of the battery device. At the same time, only the flange needs to be extended to cover the end cap, eliminating the need for additional heat dissipation components. The thermal management component can better fit the shape of the battery cell and the busbar, making full use of the internal space of the battery device, thereby improving the space utilization rate of the battery device.

[0016] In some embodiments, the motherboard body has a protrusion protruding toward the direction of the battery cell, a first gap is formed between two adjacent busbars along the second direction, and a second gap is formed between two adjacent busbars along the third direction. The first gap and / or the second gap accommodate the protrusion, and the protrusion is adapted to fit against one side of the busbar and the end cap of the battery cell.

[0017] In the above technical solution, by providing protrusions in the first gap and / or the second gap, the busbar gap space is fully utilized, the contact area between the thermal management component and the busbar and battery cells is increased, the local overheating phenomenon is alleviated, and the heat generated by the busbar and battery cells can be transferred to the cooling medium in the thermal management component more effectively, thereby improving heat dissipation efficiency and reducing the temperature of the busbar and battery cells. At the same time, the protrusions also play a supporting role. When the battery device is subjected to vibration or impact, the protrusions can reduce the relative displacement between the busbar and battery cells, reduce the risk of breakage at the connection point, and thus improve the reliability of the battery device.

[0018] In some embodiments, the height h of the flange along the first direction satisfies: 2mm≤h≤8mm.

[0019] In some embodiments, the thermal management component further includes an extension plate connected to the flange, the extension plate being attached to at least one side surface of the plurality of battery cells where the busbar is not provided.

[0020] In some embodiments, the housing forms an inwardly open mounting slot, and at least a portion of the thermal management component is mounted in the mounting slot.

[0021] In some embodiments, the side of the thermal management component facing away from the battery cell is bonded to the housing by adhesive.

[0022] In some embodiments, when the busbar and the explosion-proof valve of the battery cell are located on the same side of the plurality of battery cells, the thermal management component is provided with a clearance opening for being disposed opposite to the explosion-proof valve.

[0023] In some embodiments, the thickness D1 of the heat exchanger satisfies: 88μm≤D1≤200μm.

[0024] In some embodiments, the heat exchanger includes a composite barrier layer, an inner barrier layer, and an outer barrier layer. The barrier layer is made of a metallic material. The inner barrier layer is disposed on the side of the barrier layer close to the heat exchange channel, and the outer barrier layer is disposed on the side of the barrier layer away from the heat exchange channel. The inner barrier layer and the outer barrier layer are made of non-metallic materials.

[0025] In some embodiments, the thickness D2 of the barrier layer satisfies: 10μm≤D2≤100μm.

[0026] In some embodiments, the inner barrier layer includes a heat-sealing layer and a first adhesive layer disposed between the heat-sealing layer and the barrier layer, and the outer barrier layer includes a protective layer and a second adhesive layer disposed between the protective layer and the barrier layer.

[0027] In some embodiments, the outer barrier layer further includes an anti-corrosion layer and a third adhesive layer disposed between the anti-corrosion layer and the protective layer.

[0028] In some embodiments, the outer barrier layer further includes a thermally conductive layer and a fourth adhesive layer disposed between the thermally conductive layer and the protective layer.

[0029] Secondly, embodiments of this application provide an electrical device, including: a battery device as described in any of the above embodiments, the battery device being used to store or provide electrical energy. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0032] Figure 2 This is one of the exploded views of the battery device provided in some embodiments of this application;

[0033] Figure 3This is the second exploded view of the structure of the battery device provided in some embodiments of this application;

[0034] Figure 4 Cross-sectional views of a battery device provided for some embodiments of this application;

[0035] Figure 5 One of the partial cross-sectional views of a battery device provided in some embodiments of this application;

[0036] Figure 6 A second partial cross-sectional view of a battery device provided for some embodiments of this application;

[0037] Figure 7 This is a schematic diagram of the structure of a thermal management component provided in some embodiments of this application;

[0038] Figure 8 for Figure 7 Enlarged view of the structure at point A in the middle.

[0039] Figure label:

[0040] 1000 vehicles;

[0041] Battery device 100;

[0042] Box 10, first box body 11, second box body 12, assembly slot 13;

[0043] Battery cell 20, terminal post 21, end cap 22, explosion-proof valve 23;

[0044] Busbar 30, first gap 301, second gap 302;

[0045] Thermal management component 40, heat exchanger 40a, heat exchange channel 40b, main body 41, protrusion 411, clearance 412, flange 42, first section 421, second section 422;

[0046] Controller 200; Motor 300. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0053] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0054] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0055] Battery cells can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to any of these. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to any of these types either.

[0056] A battery cell includes a casing, electrode components, and electrolyte. The casing houses the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive current collector includes a current collector body and a positive electrode tab. The positive active material layer is coated on the surface of the current collector body, while the positive electrode tab is not coated with the positive active material layer and protrudes from the current collector body. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative current collector includes a current collector body and a negative electrode tab. The negative active material layer is coated on the surface of the current collector body, while the negative electrode tab is not coated with the negative active material layer and protrudes from the current collector body. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0057] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0058] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, including aircraft, rockets, space shuttles, and spacecraft. Battery cells are used to store or provide electrical energy.

[0059] The inventors discovered that, in order to dissipate heat from the busbar of a battery device, an aluminum alloy water-cooled plate is typically used to conduct heat through contact with the busbar. While the aluminum alloy water-cooled plate can meet the heat dissipation requirements to a certain extent, it has significant drawbacks. On the one hand, the aluminum alloy water-cooled plate is difficult to adapt to the deformation or vibration of the busbar, and long-term use can easily lead to poor contact and reduced heat dissipation efficiency. On the other hand, the aluminum alloy water-cooled plate is relatively heavy, increasing the overall weight of the battery device and hindering its lightweight design. Furthermore, the manufacturing and logistics costs of the aluminum alloy water-cooled plate are high, increasing the production cost of the battery device.

[0060] Based on the above considerations, in order to solve the problems of low heat dissipation efficiency, large weight, and high cost of heat dissipation components used to cool the busbar, the inventors, after in-depth research, designed a battery device, including: a housing, a thermal management component, a busbar, and multiple battery cells. The multiple battery cells are housed within the housing; the busbar is electrically connected to the multiple battery cells; the thermal management component is housed within the housing and configured to exchange heat with at least the busbar; wherein, the thermal management component includes at least two heat exchange elements, which are stacked to form a heat exchange channel between adjacent layers of heat exchange elements. The heat exchange channel is used to conduct the heat exchange medium that exchanges heat with the busbar, and at least one heat exchange element is a flexible element with an elastic modulus less than or equal to 300 MPa.

[0061] In this battery device structure, by cooling at least part of the thermal management component via a busbar, the thermal management component can effectively exchange heat with the busbar, promptly removing the heat generated by the busbar. Furthermore, it can adapt to thermal expansion and contraction or vibration of the busbar during long-term use, maintaining efficient and stable heat dissipation. On the other hand, for the same size, the weight of the thermal management component is significantly reduced compared to existing aluminum water-cooled plates, thereby reducing the overall weight of the battery device and achieving a lightweight design. This, in turn, helps to improve the energy density of the battery device. Moreover, it significantly reduces manufacturing and logistics costs, thus effectively controlling the cost of the battery device.

[0062] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0063] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0064] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0065] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0066] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0067] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0068] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0069] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0070] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0071] The technical solutions described in this application are applicable to various electrical devices that use battery devices. These devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. The battery device is used to store or provide electrical energy.

[0072] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0073] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle, and the battery device 100 can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0074] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0075] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a plurality of battery cells 20, which are housed within the housing 10. The housing 10 provides assembly space for the battery cells 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cells 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as cylinder, cuboid, etc.

[0076] In the battery device 100, multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0077] The technical solutions described in this application can also be applied to various energy storage devices that use individual battery cells or battery devices. These energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours.

[0078] According to some embodiments of this application, refer to Figure 3 and further refer to Figure 4This application provides a battery device 100, including: a housing 10, a thermal management component 40, a busbar 30, and a plurality of battery cells 20. The plurality of battery cells 20 are disposed within the housing 10; the busbar 30 is electrically connected to the plurality of battery cells 20; the thermal management component 40 is disposed within the housing 10 and configured to exchange heat with at least the busbar 30; wherein the thermal management component 40 includes at least two heat exchange elements 40a, the heat exchange elements 40a are stacked to form a heat exchange channel 40b between adjacent layers of heat exchange elements 40a, the heat exchange channel 40b is used to conduct the heat exchange medium that exchanges heat with the busbar 30, and at least one heat exchange element 40a is configured as a flexible element with an elastic modulus less than or equal to 300 MPa.

[0079] For example, refer to Figure 3 The housing 10 is used to provide assembly space for the battery cell 20. The housing 10 may include a first housing body 1111 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other along a first direction. The first housing body 11 and the second housing body 12 are both hollow structures with one side open. The first housing body 11 and the second housing body 12 together define the assembly space for accommodating the battery cell 20.

[0080] The thermal management component 40 can be a double-layer structure consisting of two heat exchanger elements 40a, or a multi-layer structure consisting of more than two heat exchanger elements 40a. This application embodiment does not limit this.

[0081] The flow channel 40b can be of various shapes, such as straight, serpentine, or mesh. The specific dimensions of the flow channel 40b can be designed according to actual heat dissipation requirements, and this embodiment does not limit this.

[0082] The cooling medium may include, but is not limited to, water, ethylene glycol aqueous solution or mineral oil. Different cooling media have different heat capacity and thermal conductivity, and can be selected according to the heat dissipation requirements and working environment of the battery device 100. This application embodiment does not limit this.

[0083] In a multi-layer heat exchanger 40a, at least some heat exchanger elements 40a may be flexible elements. In other words, the elastic modulus E of at least some heat exchanger elements 40a may satisfy: 0 MPa. <E≤300MPa。

[0084] Specifically, the elastic modulus E of the heat exchanger 40a, which is configured as a flexible component, can be 10MPa, 74.5MPa, 100MPa, 150MPa, 200MPa, 278.49MPa, 300MPa, or other values ​​between 0MPa and 300MPa. This application embodiment does not limit this value.

[0085] For example, in some embodiments, the thermal management component 40 may include two heat exchanger layers 40a, both of which may be flexible membrane materials, i.e., the elastic modulus of both heat exchanger layers 40a is less than or equal to 300 MPa. The elastic modulus of the two heat exchanger layers 40a may be equal or unequal.

[0086] For example, in some other embodiments, the thermal management component 40 may include two heat exchanger layers 40a, wherein the heat exchanger layer 40a closest to the busbar may be a flexible membrane material, that is, the elastic modulus of the heat exchanger layer 40a closest to the busbar is less than or equal to 300 MPa.

[0087] The flow channels 40b can be sealed between the multi-layer heat exchanger elements 40a by hot pressing, ultrasonic welding, adhesive bonding or other connection methods, and this application embodiment does not limit this.

[0088] For example, two adjacent heat exchanger layers 40a can be processed into a heat management component 40 with a flow channel 40b by a heat sealing process. The heat sealing temperature can be 170°C to 210°C and the heat sealing time can be 3s to 10s.

[0089] In some embodiments, the thermal management component 40 and the busbar 30 can exchange heat through direct contact, that is, the surface of the thermal management component 40 is in close contact with the busbar 30, and heat exchange occurs through thermal conduction. In other embodiments, the thermal management component 40 and the busbar 30 can also exchange heat through thermally conductive media such as thermally conductive adhesive or thermally conductive pads.

[0090] The thermal management component 40 may cool the busbar 30 alone, or it may cool the busbar 30 and at least some of the multiple battery cells 20 together. This application embodiment does not limit this.

[0091] Understandably, the thermal management component 40 allows the cooling medium to circulate within the flow channel 40b formed between at least two layers of heat exchangers 40a. When the busbar 30 generates heat during current transmission, the heat can be rapidly transferred to the cooling medium because at least a portion of the thermal management component 40 exchanges heat with the busbar 30. Furthermore, utilizing the high flexibility of the heat exchangers 40a, the thermal management component 40 can deform accordingly when the battery device 100 is subjected to external vibrations or when the busbar 30 undergoes slight deformation due to charging or discharging, maintaining good contact with the busbar 30 at all times. For example, during vehicle operation, the battery device 100 may experience vibrations from road bumps. Traditional rigid water-cooled plates may suffer from poor contact with the busbar 30 due to vibrations, affecting heat dissipation. However, the thermal management component 40 can adapt well to such vibrations, maintaining efficient heat dissipation performance.

[0092] Furthermore, the thermal management component 40 has a significant advantage in terms of weight compared to traditional aluminum stamped water-cooling plates. For example, for the same size, the thermal management component 40 can reduce the weight by approximately 90% compared to a traditional aluminum stamped water-cooling plate. This not only reduces the overall weight of the battery device 100, but also significantly improves energy efficiency and increases driving range for weight-sensitive applications such as vehicles. At the same time, the manufacturing cost of the thermal management component 40 is relatively low, and the manufacturing process is relatively simple, reducing complex machining and welding processes, thereby lowering production costs and meeting the dual requirements of lightweighting and cost reduction for the battery device 100.

[0093] The battery device 100 provided in this application embodiment, through the structural design of at least a portion of the thermal management component 40 exchanging heat with the busbar 30, can promptly remove the heat generated by the busbar 30. Furthermore, it can adapt to deformation or vibration of the busbar 30 during long-term use, maintaining efficient and stable heat dissipation. Moreover, under the same size, the weight of the thermal management component 40 is significantly reduced compared to the weight of a traditional aluminum water-cooled plate, thereby reducing the overall weight of the battery device 100 and achieving a lightweight design. This, in turn, helps to improve the energy density of the battery device 100. In addition, it significantly reduces manufacturing and logistics costs, thereby lowering the production cost of the battery device 100 and facilitating its promotion and use.

[0094] According to some embodiments of this application, refer to Figure 5 and further refer to Figure 6 The thermal management component 40 is at least attached to the surface of the busbar 30 away from the terminal post 21 of the battery cell 20 in the first direction.

[0095] The electrode posts 21 can be distributed in any of the following forms on the battery cell 20:

[0096] First, refer to Figure 5 With the battery cells 20 having tabs on the same side, the positive and negative terminals 21 of the battery cells 20 are located on the same side. Thus, all busbars 30 are arranged on the same side of multiple battery cells 20. The flexible liquid cooling component only needs to be arranged on this side of multiple battery cells 20 to achieve heat dissipation and cooling of all busbars 30.

[0097] Secondly, the battery cell 20 has tabs on both sides. In this case, the positive and negative terminals 21 of the battery cell 20 are located on both sides respectively. Thus, multiple busbars 30 are distributed on both sides of multiple battery cells 20. Flexible liquid cooling components are arranged on both sides of multiple battery cells 20 to achieve heat dissipation and cooling of all busbars 30.

[0098] In this embodiment, refer to Figures 3-6As shown, the busbar 30 may include two large surfaces opposite each other along a first direction and multiple side surfaces located between the two large surfaces. Since the busbar 30 is sheet-shaped, the area of ​​the side surfaces is much smaller than the area of ​​the large surfaces. The large surface near the battery cell 20 can be connected to the terminal post 21 by welding or other means. Considering that if the thermal management component 40 is attached to the area of ​​the large surface that is not connected to the terminal post 21, the connection between the busbar 30 and the terminal post 21 will be subjected to certain stress. The connection between the busbar 30 and the terminal post 21 is prone to breakage due to stress, which directly affects the performance of the entire battery device 100, this application attaches the thermal management component 40 at least to the surface of the busbar 30 away from the terminal post 21. The surface of the busbar 30 away from the terminal post 21 is the other large surface of the busbar 30, so that there is sufficient heat exchange area between the thermal management component 40 and the busbar 30. The thermal management component 40 can quickly remove the heat generated by the busbar 30 and effectively reduce the operating temperature of the busbar 30.

[0099] The battery device 100 provided in this application embodiment, through the structural design of the thermal management component 40 being at least attached to the surface of the terminal post 21 of the busbar 30 away from the battery cell 20 along the first direction, can make full use of the large surface area of ​​the busbar 30 for heat exchange without affecting the connection reliability between the busbar 30 and the terminal post 21, providing sufficient heat exchange area, which helps to improve the heat dissipation efficiency of the busbar 30, so that the heat generated by the busbar 30 can be carried away by the cooling medium in time, and the temperature of the busbar 30 can be effectively reduced in a short time.

[0100] According to some embodiments of this application, refer to Figures 3-6 As shown, multiple battery cells 20 are arranged along a second direction and a third direction. The thermal management component 40 includes a main board body 41 and a flange 42 folded relative to the main board body 41 toward the direction of the battery cells 20. The flange 42 is connected to at least one side of the main board body 41 along the second direction and the third direction. The main board body 41 is attached to the surface of the busbar 30 away from the terminal post 21 along the first direction. The flange 42 is attached to at least one side of the outermost busbar 30. The first direction, the second direction and the third direction intersect each other.

[0101] Unless otherwise specified, refer to Figure 3 and further refer to Figure 4 The first direction of this application is the vertical direction, and the second and third directions of this application are two directions that intersect perpendicularly in the horizontal plane.

[0102] The thermal management component 40 can be at least one of the following structural forms:

[0103] Firstly, the main board body 41 is connected to a flange 42 on one side along the second direction;

[0104] Secondly, refer to Figures 3-6As shown, the main body 41 has flanges 42 connected to both sides along the second direction;

[0105] Third, the motherboard body 41 is connected to a flange 42 on one side along a third direction;

[0106] Fourth, the main board body 41 is connected to flanges 42 on both sides along the third direction;

[0107] Fifth, the main body 41 is connected to a flange 42 on one side along the second direction and on one side along the third direction.

[0108] Sixth, the main body 41 is connected to flanges 42 on both sides along the second direction and on one side along the third direction.

[0109] Seventh, the main body 41 is connected to a flange 42 on one side along the second direction and on both sides along the third direction.

[0110] Eighth, the main body 41 is connected to flanges 42 on both sides along the second direction and on both sides along the third direction.

[0111] The flange 42 can be formed by cold stamping or other processing techniques using a multi-layer heat exchanger 40a, or it can be formed by directly clamping the multi-layer heat exchanger 40a between the housing 10 and the battery cell 20 using its own flexibility. This application does not limit this.

[0112] For example, the flange 42 can be formed by cold stamping of multi-layer heat exchanger 40a, which allows for more precise control of the shape of the flange 42 to accommodate more cooling medium.

[0113] Reference Figures 3-6 As shown, the busbar 30 may include two large faces opposite each other along a first direction and multiple side faces located between the two large faces, wherein multiple means two or more.

[0114] For example, refer to Figure 3 The busbar 30 is square-shaped, meaning that the busbar 30 may include two large surfaces and four side surfaces located between the two large surfaces.

[0115] In this embodiment, refer to Figures 3-6As shown, multiple busbars 30 are arranged along a second direction and a third direction. The main board body 41 is attached to the surface of the multiple busbars 30 away from the terminal post 21 along the first direction, that is, the large surface of the multiple busbars 30 away from the terminal post 21, realizing contact heat exchange between the thermal management component 40 and the large surface of the multiple busbars 30. The flange 42 is folded relative to the main board body 41 in the first direction toward the direction close to the battery cell 20. For at least a portion of the multiple busbars 30 located at the edge, the flange 42 can be attached to at least one side of that portion of the busbars 30, realizing contact heat exchange between the thermal management component 40 and at least one side of the at least portion of the busbars 30 located at the edge.

[0116] The battery device 100 provided in this application embodiment, through the aforementioned main board body 41 and flange 42, allows most of the heat from the multiple busbars 30 to be quickly dissipated through the contact between the large surface and the main board body 41, while the contact between the side surface and the flange 42 assists in heat dissipation, forming a three-dimensional heat dissipation channel. In addition to cooling the large surface of the multiple busbars 30, the outermost part of the busbars 30 is subjected to additional side cooling, further increasing the heat exchange area of ​​the thermal management component 40 to the multiple busbars 30, thereby further improving heat dissipation efficiency. Furthermore, the arrangement of the flange 42 makes full use of the space on the side of the busbars 30 without increasing the overall size of the battery device 100, thereby improving the internal space utilization of the battery device 100 and helping to achieve the compactness and miniaturization of the battery device 100.

[0117] According to some embodiments of this application, refer to Figure 5 and further refer to Figure 8 The flange 42 includes a first section 421 and a second section 422 that are bent and connected. The first section 421 is connected between the main board body 41 and the second section 422, and the first section 421 is attached to one side of the outermost busbar 30. The second section 422 is attached to the end cap 22 of the outermost battery cell 20.

[0118] The bending angle between the first segment 421 and the second segment 422 matches the angle between the side of the busbar 30 and the end cap 22 of the battery cell 20. This application embodiment does not limit this.

[0119] In this embodiment, refer to Figure 5 and further refer to Figure 8 Multiple busbars 30 are arranged along the second direction and the third direction. Both sides of the main board body 41 along the second direction can be connected with flanges 42. The first section 421 and the second section 422 of each flange 42 can be bent at a right angle. The first section 421 can be attached to the outer side of the outermost busbar 30 along the second direction, and the second section 422 can be attached to the end cap 22 of the busbar 30 arranged on the outermost battery cell 20.

[0120] In other embodiments, multiple busbars 30 are arranged along a second direction and a third direction. Both sides of the main board body 41 along the third direction can be connected with flanges 42. The first segment 421 and the second segment 422 of each flange 42 can be bent at a right angle. The first segment 421 can be attached to the outer side of the outermost busbar 30 along the third direction, and the second segment 422 can be attached to the end cap 22 of the busbar 30 arranged on the outermost battery cell 20.

[0121] The battery device 100 provided in this application embodiment, through the structural design of the flange 42 consisting of the first segment 421 and the second segment 422, enables the thermal management component 40 to not only provide heat dissipation to the large surfaces of each busbar 30 and some of the sides of the busbar 30, but also to directly transfer the heat generated by the end cap 22 of the outermost battery cell 20 to the internal cooling medium. This can effectively reduce the temperature of the end cap 22 of the outermost battery cell 20. Using this structure increases the heat exchange area and heat exchange path of the thermal management component 40, thereby improving the overall heat exchange efficiency of the battery device 100. At the same time, only the flange 42 needs to be extended to cover the end cap 22, without the need for additional heat dissipation components. The thermal management component 40 can better fit the shape of the battery cell 20 and the busbar 30, making full use of the internal space of the battery device 100, thereby improving the space utilization rate of the battery device 100.

[0122] According to some embodiments of this application, refer to Figure 3 , Figure 6 and Figure 7 As shown, the main board body 41 is provided with a protrusion 411 protruding towards the direction of the battery cell 20, a first gap 301 is formed between two adjacent busbars 30 along the second direction, and a second gap 302 is formed between two adjacent busbars 30 along the third direction. The first gap 301 and / or the second gap 302 accommodate the protrusion 411. The protrusion 411 is adapted to fit against one side of the busbar 30 and the end cap 22 of the battery cell 20.

[0123] The protrusion 411 can be formed by cold stamping or other processing techniques from the multi-layer heat exchanger 40a, or it can be formed by directly pressing the multi-layer heat exchanger 40a into the first gap 301 and / or the second gap 302 using its own flexibility. This application does not limit this.

[0124] For example, the protrusion 411 can be formed by cold stamping of multi-layer heat exchanger 40a, which allows for more precise control of the shape of the protrusion 411 to accommodate more cooling medium.

[0125] In this embodiment, refer to Figure 3 , Figure 6 and Figure 7As shown, multiple busbars 30 are arranged along a second direction and a third direction. A first gap 301 is formed between two adjacent busbars 30 along the second direction, and the first gap 301 accommodates a protrusion 411. A single protrusion 411 can be installed in multiple first gaps 301 that are flush with each other along the third direction. Multiple first gaps 301 that are spaced apart along the second direction can accommodate multiple protrusions 411 one by one. The protrusions 411 can extend along the third direction and can be U-shaped to fit one side of each of the two corresponding busbars 30 and the end caps 22 of the two corresponding battery cells 20.

[0126] In other embodiments, a plurality of busbars 30 are arranged along a second direction and a third direction, with a second gap 302 formed between two adjacent busbars 30 along the third direction, the second gap 302 accommodating a protrusion 411. A single protrusion 411 can be installed within a plurality of second gaps 302 flush along the second direction, and a plurality of second gaps 302 spaced apart along the third direction can each accommodate a plurality of protrusions 411.

[0127] In some other embodiments, a plurality of busbars 30 are arranged along a second direction and a third direction, with a first gap 301 formed between two adjacent busbars 30 along the second direction and a second gap 302 formed between two adjacent busbars 30 along the third direction. Both the first gap 301 and the second gap 302 accommodate a protrusion 411. In this case, at least two of the protrusions 411 intersect.

[0128] The battery device 100 provided in this application embodiment, by providing a protrusion 411 in the first gap 301 and / or the second gap 302, makes full use of the gap space of the busbar 30, increases the contact area between the thermal management component 40 and the busbar 30 and the battery cell 20, alleviates local overheating, and can more effectively transfer the heat generated by the busbar 30 and the battery cell 20 to the cooling medium in the thermal management component 40, improve heat dissipation efficiency, and reduce the temperature of the busbar 30 and the battery cell 20. At the same time, the protrusion 411 also plays a supporting role. When the battery device 100 is subjected to vibration or impact, the protrusion 411 can reduce the relative displacement between the busbar 30 and the battery cell 20, reduce the risk of breakage of the connection part, and thus improve the reliability of the battery device 100.

[0129] According to some embodiments of this application, refer to Figure 5 As shown, the height h of the flange 42 along the first direction satisfies: 2mm≤h≤8mm.

[0130] Specifically, the height h of the flange 42 along the first direction can be 2mm, 3.7mm, 4.83mm, 5mm, 6.894mm, 7.2986mm, 8mm or other values ​​between 2mm and 8mm. This application embodiment does not limit this value.

[0131] For example, the height h of the flange 42 along the first direction satisfies: 4mm≤h≤6mm.

[0132] In this case, the height h of the flange 42 along the first direction can be 4mm, 4.2mm, 4.746mm, 5mm, 5.35mm, 5.7539mm, 6mm or other values ​​between 4mm and 6mm. This application embodiment does not limit this value.

[0133] The battery device 100 provided in this application embodiment, by limiting the range of the height h of the flange 42 along the first direction, can better cover the side of the busbar 30 and the end cap 22 of the battery cell 20, increase the heat dissipation contact area, thereby improving the heat dissipation efficiency. When the cooling medium passes through the flow channel 40b in the flange 42, it can more effectively absorb heat and carry it away. At the same time, the appropriate height also effectively controls the amount of material used in the thermal management component 40, simplifies the manufacturing process, and thus reduces the production cost of the thermal management component 40.

[0134] According to some embodiments of this application, the thermal management component 40 also includes an extension plate connected to the flange 42, the extension plate being attached to at least one side surface of the plurality of battery cells 20 where the busbar 30 is not provided.

[0135] Reference Figure 3 A battery pack formed by stacking multiple battery cells 20 has two large surfaces and four side surfaces that are opposite each other along a first direction, and a busbar 30 can be distributed on at least one of the two large surfaces.

[0136] In some embodiments, the battery cells 20 have tabs on the same side, meaning the positive and negative terminals 21 of the battery cells 20 are located on the same side. Thus, all busbars 30 are arranged on the same side of the multiple battery cells 20, and cooling of all busbars 30 can be achieved by simply placing a flexible liquid cooling component on that side of the multiple battery cells 20. In this case, if other sides of the battery pack formed by stacking multiple battery cells 20 have heat dissipation requirements, the flexible liquid cooling component can be extended to form an extension plate. The extension plate can be attached to another large surface and at least one of the four sides.

[0137] In other embodiments, the battery cell 20 has tabs on both sides, meaning the positive and negative terminals 21 of the battery cell 20 are located on both sides respectively. Thus, multiple busbars 30 are distributed on both sides of the multiple battery cells 20, and flexible liquid cooling components are arranged on both sides of the multiple battery cells 20 to achieve heat dissipation and cooling of all busbars 30. In this case, if other sides of the battery pack formed by stacking multiple battery cells 20 have heat dissipation requirements, at least one of the two flexible liquid cooling components on the two large surfaces can be extended to form an extension plate, which can be attached to at least one of the four sides; or the two flexible liquid cooling components on the two large surfaces can be connected and integrated into one unit through the extension plate, which can be attached to at least one of the four sides.

[0138] The battery device 100 provided in this application embodiment, through the above-mentioned extension plate, can not only meet the heat dissipation requirements of the busbar 30, but also meet the heat dissipation requirements of other surfaces of multiple battery cells 20, so as to construct a three-dimensional thermal management structure. The extension plate enables a single thermal management component 40 to perform large-area cooling on multiple surfaces of the busbar 30 and multiple battery cells 20, thereby improving the thermal management performance of the entire battery device 100, adapting to the heat dissipation requirements of different battery devices 100, and increasing the versatility, adaptability and scalability of the thermal management component 40.

[0139] According to some embodiments of this application, refer to Figure 5 and further refer to Figure 6 The housing 10 forms an inwardly open mounting slot 13, and at least a portion of the thermal management component 40 is mounted in the mounting slot 13.

[0140] In this embodiment, refer to Figure 5 and further refer to Figure 6 The main body 41 of the thermal management component 40 is entirely housed within the assembly groove 13, and the main body 41 is clamped between the surface of the busbar 30 facing away from the terminal post 21 of the battery cell 20 in the first direction and the bottom wall of the assembly groove 13. The flange 42 of the thermal management component 40 is partially housed within the assembly groove 13. Specifically, the first section 421 of the flange 42 is entirely housed within the assembly groove 13, and the first section 421 is clamped between the side of the busbar 30 and the side wall of the assembly groove 13. The second section 422 of the flange 42 is arranged outside the assembly groove 13, and the second section 422 is clamped between the outer periphery of the assembly groove 13 and the end cap 22 of the battery cell 20.

[0141] In other embodiments, the thermal management component 40 is integrally housed within the assembly slot 13.

[0142] The battery device 100 provided in this application embodiment achieves integrated assembly of the thermal management component 40 and the housing 10 through a structural design in which at least a portion of the thermal management component 40 is installed in the assembly slot 13 of the housing 10. On one hand, the housing 10 provides reliable structural support for the thermal management component 40, enabling it to maintain a stable shape and position within the battery device 100, thereby maintaining flow stability and limiting the range of motion of the thermal management component 40. This maintains good long-term contact between the thermal management component 40 and the battery cell 20, optimizing heat dissipation under long-term use. On the other hand, the assembly slot 13 provides clear positioning and guidance for the installation of the thermal management component 40, significantly increasing the speed of the installation process. Furthermore, the tight integration of the thermal management component 40 and the housing 10 reduces the number of components inside the battery device 100, improving the integration of the battery device 100. This reduces the overall volume of the battery device 100 and improves its space utilization.

[0143] According to some embodiments of this application, the thermal management component 40 is bonded to the housing 10 on the side opposite to the battery cell 20 by adhesive.

[0144] Specifically, the side of the thermal management component 40 facing away from the battery cell 20 can be bonded to the housing 10 using double-sided adhesive, structural adhesive, or thermally conductive adhesive, etc. This application embodiment does not limit this.

[0145] The bonding process can be, but is not limited to, dispensing, coating, or spraying adhesive, and the embodiments of this application do not limit this process.

[0146] The battery device 100 provided in this application embodiment uses an adhesive bonding design between the thermal management component 40 and the housing 10 on the side opposite to the battery cell 20. This creates a tight connection between the thermal management component 40 and the housing 10, effectively reducing the risk of displacement or damage to the thermal management component 40 due to vibration or deformation during operation. This enhances the structural stability of the entire battery device 100. The adhesive bonding process is relatively simple and does not require complex processing equipment and tools, which can shorten assembly time, improve production efficiency, and reduce production costs.

[0147] According to some embodiments of this application, refer to Figure 3 and further refer to Figure 4 When the busbar 30 and the explosion-proof valve 23 of the battery cell 20 are located on the same side of multiple battery cells 20, the thermal management component 40 is provided with a clearance opening 412 for being disposed opposite to the explosion-proof valve 23.

[0148] In this implementation, refer to Figure 3 and further refer to Figure 4The battery cells 20 have tabs on the same side, meaning the positive and negative terminals 21 of the battery cells 20 are located on the same side. Thus, all busbars 30 are arranged on the same side of multiple battery cells 20. The explosion-proof valves 23 and busbars 30 are located on the same side of multiple battery cells 20, and the explosion-proof valves 23 of the battery cells 20 are located between the positive and negative terminals 21 of the battery cells 20. Since multiple battery cells 20 are arranged along the second direction and the third direction, multiple explosion-proof valves 23 of multiple battery cells 20 are arranged along the second direction and the third direction. The clearance opening 412 can extend along the third direction. A single clearance opening 412 can be used to avoid multiple explosion-proof valves 23 of multiple battery cells 20 that are spaced apart along the third direction. The multiple explosion-proof valves 23 of multiple battery cells 20 that are spaced apart along the second direction correspond one-to-one with multiple clearance openings 412. Here, "multiple" means two or more.

[0149] The battery device 100 provided in this application embodiment effectively reduces the risk of interference between the thermal management component 40 and the explosion-proof valve 23 during the operation of the battery device 100 by setting the above-mentioned clearance port 412. It provides sufficient space for the explosion-proof valve 23 to open and operate in an emergency. When the internal pressure of the battery cell 20 is too high, the explosion-proof valve 23 can open normally and release the internal pressure of the battery cell 20 in time, reducing the risk of serious safety accidents such as the explosion of the battery cell 20, thereby improving the operational reliability of the battery device 100.

[0150] According to some embodiments of this application, refer to Figure 5 As shown, the thickness D1 of the heat exchanger 40a satisfies: 88μm≤D1≤200μm.

[0151] In actual design, the thickness can be matched according to the required burst pressure and shelf life of the thermal management component 40.

[0152] Specifically, the thickness D1 of the heat exchanger 40a can be 88μm, 96.5μm, 100μm, 125.36μm, 158.246μm, 197.2642μm, 200μm or other values ​​between 88μm and 200μm. This application embodiment does not limit this.

[0153] The battery device 100 provided in this application embodiment, by limiting the range of thickness D1 of the heat exchanger 40a as described above, helps to maintain the normal flow of the cooling medium in the flow channel 40b. Without seriously negatively affecting the heat dissipation efficiency, it can provide sufficient structural strength to resist external impacts and internal pressure generated by the cooling medium, reducing the risk of cracking or leakage of the heat exchanger 40a, thereby enhancing the durability and fatigue strength of the thermal management component 40, and thus extending the service life of the thermal management component 40. In addition, the appropriate thickness can also reduce the amount of material used, thereby reducing the production cost of the thermal management component 40.

[0154] According to some embodiments of this application, the flexible component includes a composite barrier layer, an inner barrier layer, and an outer barrier layer. The barrier layer is made of a metallic material, the inner barrier layer is disposed on the side of the barrier layer near the flow channel 40b, and the outer barrier layer is disposed on the side of the barrier layer away from the flow channel 40b. The inner and outer barrier layers are made of non-metallic materials.

[0155] The barrier layer made of metal material can be used to block oxygen and water vapor. The metal material may include, but is not limited to, aluminum foil or stainless steel foil. This application does not limit this.

[0156] Non-metallic inner and outer barrier layers can be used to enhance the barrier effect and protect the barrier layer, while also addressing the electrochemical corrosion problems associated with barrier layers made of metallic materials. Therefore, the chemical stability and insulation performance of the inner and outer barrier layers must be considered when selecting materials. Appropriate materials can be chosen based on different application scenarios to achieve the barrier effect against specific substances.

[0157] The non-metallic materials may include, but are not limited to, PI (Polyimide), PET (polyethylene glycol terephthalate), PP (Polypropylene), PE (Polyethylene), PC (Polycarbonate), or ceramic coating materials, etc., and the embodiments of this application do not limit them.

[0158] The composite process of heat exchanger 40a may include, but is not limited to, lamination composite, coating composite, sputtering plating of heat exchanger 40a, or co-extrusion composite, etc., and the embodiments of this application do not limit this.

[0159] The battery device 100 provided in this application embodiment, through the composite design of the aforementioned barrier layer, inner barrier layer, and outer barrier layer, achieves the following: Firstly, the metal barrier layer effectively blocks the penetration of gases such as water vapor and oxygen, improving the sealing and durability of the thermal management component 40. The non-metallic materials of the inner and outer barrier layers further enhance the barrier performance of the heat exchange component 40a, significantly reducing the risk of cooling medium leakage. Secondly, the metal barrier layer has good thermal conductivity, enabling rapid heat transfer to the cooling medium and improving the overall heat transfer coefficient of the thermal management component 40. The non-metallic inner and outer barrier layers can, to a certain extent, regulate the heat transfer path, ensuring uniform heat distribution within the heat exchange component 40a, alleviating local overheating, and further optimizing the heat dissipation effect. Thirdly, the metal barrier layer provides good mechanical strength and puncture resistance, protecting the heat exchange component 40a from damage during operation. The non-metallic materials of the inner and outer barrier layers increase the flexibility and impact resistance of the heat exchange component 40a, allowing it to adapt to the deformation and vibration of the battery device 100.

[0160] According to some embodiments of this application, the thickness D2 of the barrier layer satisfies: 10μm≤D2≤100μm.

[0161] Specifically, the thickness D2 of the barrier layer can be 10μm, 25μm, 47.4μm, 60μm, 74.85μm, 96.366μm, 100μm or other values ​​between 10μm and 100μm, and the embodiments of this application do not limit this.

[0162] The battery device 100 provided in this application embodiment can effectively block the penetration of gases such as water vapor and oxygen by limiting the range of the thickness D2 of the barrier layer, thereby improving the sealing and durability of the thermal management component 40, maintaining the chemical stability of the cooling medium during long-term use, enhancing the durability of the heat dissipation effect of the thermal management component 40, and giving the barrier layer sufficient flexibility to adapt to deformation and vibration, minimizing the obstruction to heat conduction, thereby improving heat dissipation efficiency. In addition, the moderate thickness not only facilitates processing and reduces processing costs, but also reduces the amount of metal material used, thereby effectively controlling the production cost of the thermal management component 40.

[0163] According to some embodiments of this application, the inner barrier layer includes a heat-sealing layer and a first adhesive layer disposed between the heat-sealing layer and the barrier layer, and the outer barrier layer includes a protective layer and a second adhesive layer disposed between the protective layer and the barrier layer.

[0164] The heat-sealing layer possesses excellent heat-sealing adhesion and hydrolysis resistance, and can rapidly melt and seal with other materials under certain temperature and pressure conditions. Specifically, the heat-sealing layer can be made of PP (Polypropylene) or PE (Polyethylene), etc., and this application does not limit this.

[0165] The first adhesive layer is used to bond the heat-sealing layer and the barrier layer. It can be a modified epoxy adhesive, polyurethane adhesive, acrylic adhesive or silane coupling agent, etc., and the embodiments of this application do not limit it.

[0166] The protective layer has good wear and scratch resistance, effectively protecting the metal barrier layer in the center of the inner layer. Specifically, the protective layer can be made of PET (polyethylene glycol terephthalate) or PA (polyamide), etc., and this application does not limit this.

[0167] The second adhesive layer is used to bond the protective layer and the barrier layer. It can be a modified epoxy adhesive, polyurethane adhesive, acrylic adhesive or silane coupling agent, etc., and the embodiments of this application do not limit it.

[0168] In this case, the multi-layer composite structure of the heat exchanger 40a, from the inside to the outside, is as follows: heat sealing layer - first adhesive layer - barrier layer - second adhesive layer - protective layer.

[0169] The battery device 100 provided in this application embodiment, through the above-mentioned heat-sealing layer and protective layer, enables adjacent heat exchange components 40a to be firmly bonded under certain temperature and pressure, forming a closed flow channel 40b, which improves the sealing performance of the thermal management component 40. Throughout the entire life cycle of the battery device 100, the leakage rate of the cooling medium is significantly reduced, reducing heat dissipation failure and damage to the battery device 100 caused by leakage. Furthermore, the protective layer can greatly reduce the probability of scratch damage to the barrier layer, increase the integrity of the barrier layer under long-term use, and extend the service life of the thermal management component 40, thereby improving the overall reliability of the battery device 100. In addition, the combination of the first adhesive layer and the second adhesive layer greatly improves the interlayer bonding strength, realizing a firm bond between the inner and outer barrier layers and the barrier layer, thereby improving the overall structural stability of the thermal management component 40 in complex environments.

[0170] According to some embodiments of this application, the outer barrier layer further includes an anti-corrosion layer and a third adhesive layer disposed between the anti-corrosion layer and the protective layer.

[0171] The anti-corrosion layer is used to mitigate the phenomenon of external corrosive media corroding the thermal management component 40 after the seal fails. Specifically, the anti-corrosion layer can be PI (Polyimide), epoxy resin coating or ceramic coating, etc., and this application embodiment does not limit it.

[0172] The third adhesive layer is used to bond the anti-corrosion layer and the protective layer. It can be a silicone adhesive or a modified acrylic adhesive, etc., and the embodiments of this application do not limit it.

[0173] In this case, the multi-layer composite structure of the heat exchanger 40a, from the inside out, is as follows: heat sealing layer - first adhesive layer - barrier layer - second adhesive layer - protective layer - third adhesive layer - anti-corrosion layer.

[0174] The battery device 100 provided in this application embodiment greatly improves the corrosion resistance of the heat exchange component 40a by setting the above-mentioned anti-corrosion layer and the third adhesive layer, effectively reducing the corrosion of the inner protective layer and barrier layer by external corrosive media (such as water, salt spray, etc.), significantly delaying the corrosion rate of the barrier layer after the seal fails, thereby extending the service life of the thermal management component 40 and maintaining the long-term stable operation of the battery device 100 in complex environments.

[0175] According to some embodiments of this application, the outer barrier layer further includes a thermally conductive layer and a fourth adhesive layer disposed between the thermally conductive layer and the protective layer.

[0176] The thermally conductive layer has good resistance to high and low temperatures and is used to improve the thermal conductivity of the heat exchanger 40a. Specifically, the thermally conductive layer can be made of PET (polyethylene glycol terephthalate), aluminum nitride, or graphene, etc., and this application embodiment does not limit this.

[0177] The fourth adhesive layer is used to bond the thermally conductive layer and the protective layer. It can be a polyurethane adhesive or a modified acrylate adhesive, etc., and the embodiments of this application do not limit it.

[0178] In this case, the multi-layer composite structure of the heat exchanger 40a, from the inside out, is as follows: heat-sealing layer - first adhesive layer - barrier layer - second adhesive layer - protective layer - fourth adhesive layer - thermally conductive layer.

[0179] The battery device 100 provided in this application embodiment can significantly improve the thermal conductivity of the outer resistance layer by setting the above-mentioned thermal conductive layer and the fourth adhesive layer, thereby optimizing the thermal conductivity of the outer heat exchange component 40a. During the operation of the battery device 100, the heat generated by the multiple battery cells 20 can be quickly transferred to the external environment and the cooling medium, thereby maximizing the heat dissipation performance of the thermal management component 40.

[0180] According to some embodiments of this application, this application also provides an electrical device. The electrical device includes a battery device 100 of any of the above embodiments, the battery device 100 being used to store or provide electrical energy.

[0181] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices 100.

[0182] According to some embodiments of this application, see Figures 3-8 As shown, this application provides a battery device 100, including: a housing 10, a thermal management component 40, a busbar 30, and a plurality of battery cells 20. The plurality of battery cells 20 are disposed within the housing 10, and the busbar 30 is electrically connected to the plurality of battery cells 20; the thermal management component 40 is disposed within the housing 10, and the thermal management component 40 is configured to exchange heat with at least the busbar 30; wherein, the thermal management component 40 includes at least two heat exchange elements 40a, the heat exchange elements 40a are stacked to form a heat exchange channel 40b between adjacent layers of heat exchange elements 40a, the heat exchange channel 40b is used to conduct the heat exchange medium that exchanges heat with the busbar 30, and at least one heat exchange element 40a is configured as a flexible element, the elastic modulus of the flexible element being less than or equal to 300 MPa. Multiple battery cells 20 are arranged along a second direction and a third direction. The thermal management component 40 includes a main board body 41 and a flange 42 folded towards the battery cells 20 relative to the main board body 41. The flange 42 is connected to both sides of the main board body 41 along the second direction. The main board body 41 is attached to the surface of the busbar 30 away from the terminal post 21 along the first direction. The flange 42 is attached to one side of the outermost busbar 30. The first direction, the second direction, and the third direction intersect each other. The flange 42 includes a first segment 421 and a second segment 422 that are bent and connected. The first segment 421 is connected between the main board body 41 and the second segment 422 and is attached to one side of the outermost busbar 30. The second segment 422 is attached to the end cap 22 of the outermost battery cell 20. The main body 41 has a protrusion 411 protruding towards the direction of the battery cell 20. A first gap 301 is formed between two adjacent busbars 30 along the second direction, and the first gap 301 accommodates the protrusion 411. The protrusion 411 is adapted to fit against one side of the busbar 30 and the end cap 22 of the battery cell 20. The height h of the flange 42 along the first direction satisfies: 2mm ≤ h ≤ 8mm. The housing 10 forms an inwardly open mounting groove 13, and at least a portion of the thermal management component 40 is mounted in the mounting groove 13. The side of the thermal management component 40 away from the battery cell 20 is bonded to the housing 10 with adhesive. When the busbar 30 and the explosion-proof valve 23 of the battery cell 20 are located on the same side of multiple battery cells 20, the thermal management component 40 has a clearance opening 412 for being positioned opposite to the explosion-proof valve 23.

[0183] The thickness D1 of heat exchanger 40a satisfies: 88μm ≤ D1 ≤ 200μm. The flexible component comprises a composite barrier layer, an inner barrier layer, and an outer barrier layer. The barrier layer is made of a metallic material. The inner barrier layer is located on the side of the barrier layer closest to the flow channel 40b, and the outer barrier layer is located on the side of the barrier layer away from the flow channel 40b. Both the inner and outer barrier layers are made of non-metallic materials. The thickness D2 of the barrier layer satisfies: 10μm ≤ D2 ≤ 100μm. The inner barrier layer includes a heat-sealing layer and a first adhesive layer located between the heat-sealing layer and the barrier layer. The outer barrier layer includes a protective layer and a second adhesive layer located between the protective layer and the barrier layer.

[0184] The outer barrier layer further includes an anti-corrosion layer and a third adhesive layer disposed between the anti-corrosion layer and the protective layer. Alternatively, the outer barrier layer further includes a thermally conductive layer and a fourth adhesive layer disposed between the thermally conductive layer and the protective layer.

[0185] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0186] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0187] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: Box; Multiple battery cells are housed within the casing; Busbar, electrically connecting the multiple battery cells; A thermal management component is disposed within the housing and configured to exchange heat with at least the manifold; wherein the thermal management component includes at least two heat exchange elements, the heat exchange elements are stacked to form a heat exchange channel between adjacent layers of the heat exchange elements, the heat exchange channel is used to conduct heat exchange medium that exchanges heat with the manifold, and at least one of the heat exchange elements is configured as a flexible element, the elastic modulus of the flexible element being less than or equal to 300 MPa.

2. The battery device according to claim 1, characterized in that, The thermal management component is at least attached to the surface of the busbar that is away from the terminal post of the battery cell in a first direction.

3. The battery device according to claim 2, characterized in that, The plurality of battery cells are arranged along a second direction and a third direction. The thermal management component includes a main board body and a flange folded towards the battery cells relative to the main board body. The flange is connected to at least one side of the main board body along the second direction and the third direction. The main board body is attached to the surface of the busbar away from the terminal post along the first direction. The flange is attached to at least one side of the outermost busbar. The first direction, the second direction and the third direction intersect each other.

4. The battery device according to claim 3, characterized in that, The flange includes a first section and a second section that are bent and connected. The first section is connected between the main board and the second section and is attached to one side of the outermost busbar. The second section is attached to the end cap of the outermost battery cell.

5. The battery device according to claim 3 or 4, characterized in that, The motherboard body has a protrusion protruding towards the direction of the battery cell. A first gap is formed between two adjacent busbars along the second direction, and a second gap is formed between two adjacent busbars along the third direction. The first gap and / or the second gap accommodate the protrusion. The protrusion is adapted to fit against one side of the busbar and the end cap of the battery cell.

6. The battery device according to any one of claims 3-5, characterized in that, The height h of the flange along the first direction satisfies: 2mm≤h≤8mm.

7. The battery device according to any one of claims 3-6, characterized in that, The thermal management component also includes an extension plate connected to the flange, the extension plate being attached to at least one side surface of the plurality of battery cells where the busbar is not located.

8. The battery device according to any one of claims 1-7, characterized in that, The housing forms an inwardly open mounting slot, and at least a portion of the thermal management component is mounted in the mounting slot.

9. The battery device according to any one of claims 1-8, characterized in that, The thermal management component is bonded to the housing via adhesive on the side facing away from the battery cell.

10. The battery device according to any one of claims 1-9, characterized in that, When the busbar and the explosion-proof valve of the battery cell are located on the same side of the plurality of battery cells, the thermal management component is provided with a clearance opening for being disposed opposite to the explosion-proof valve.

11. The battery device according to any one of claims 1-10, characterized in that, The thickness D1 of the heat exchanger satisfies: 88μm≤D1≤200μm.

12. The battery device according to any one of claims 1-11, characterized in that, The flexible component includes a composite barrier layer, an inner barrier layer, and an outer barrier layer. The barrier layer is made of a metallic material. The inner barrier layer is located on the side of the barrier layer close to the heat exchange channel, and the outer barrier layer is located on the side of the barrier layer away from the heat exchange channel. The inner barrier layer and the outer barrier layer are made of non-metallic materials.

13. The battery device according to claim 12, characterized in that, The thickness D2 of the barrier layer satisfies: 10μm≤D2≤100μm.

14. The battery device according to claim 12 or 13, characterized in that, The inner barrier layer includes a heat-sealing layer and a first adhesive layer disposed between the heat-sealing layer and the barrier layer, and the outer barrier layer includes a protective layer and a second adhesive layer disposed between the protective layer and the barrier layer.

15. The battery device according to claim 14, characterized in that, The outer barrier layer also includes an anti-corrosion layer and a third adhesive layer disposed between the anti-corrosion layer and the protective layer.

16. The battery device according to claim 14, characterized in that, The outer barrier layer also includes a thermally conductive layer and a fourth adhesive layer disposed between the thermally conductive layer and the protective layer.

17. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1-16, wherein the battery device is used to store or provide electrical energy.

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